Security of Smart Contract

Best practice:

• A great alternative introduction, in video, would be this one from @KonstantHacker.
• Common patterns on Solidity docs.
• Security considérantions on Solidity docs.
• A more exhaustive document regrouping more recommendations.

Videos:

1. https://www.youtube.com/watch?v=WIEessi3ntk&feature=youtu.be

Tools to check security :

1. https://github.com/melonproject/oyente